linux-kernel - Re: [PATCH] x86, acpi: Remove out-of-date comment of __acpi_map

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <51EE7BF7.80000@gmail.com>
Date:	Tue, 23 Jul 2013 20:49:59 +0800
From:	Zhang Yanfei <zhangyanfei.yes@...il.com>
To:	Ingo Molnar <mingo@...nel.org>
CC:	len.brown@...el.com, pavel@....cz, rjw@...k.pl,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86, acpi: Remove out-of-date comment of __acpi_map_table

On 07/23/2013 05:22 PM, Ingo Molnar wrote:
> 
> * Zhang Yanfei <zhangyanfei.yes@...il.com> wrote:
> 
>> From: Zhang Yanfei <zhangyanfei@...fujitsu.com>
>>
>> The implementation of function __acpi_map_table() has been changed
>> long time ago, and now it directly invokes early_ioremap() to setup
>> the temporarily acpi table mappings. So remove its out-of-date
>> comment.
>>
>> Signed-off-by: Zhang Yanfei <zhangyanfei@...fujitsu.com>
>> ---
>>  arch/x86/kernel/acpi/boot.c |   13 +------------
>>  1 files changed, 1 insertions(+), 12 deletions(-)
>>
>> diff --git a/arch/x86/kernel/acpi/boot.c b/arch/x86/kernel/acpi/boot.c
>> index d81a972..bac8b5b 100644
>> --- a/arch/x86/kernel/acpi/boot.c
>> +++ b/arch/x86/kernel/acpi/boot.c
>> @@ -140,18 +140,6 @@ static u32 irq_to_gsi(int irq)
>>  	return gsi;
>>  }
>>  
>> -/*
>> - * Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
>> - * to map the target physical address. The problem is that set_fixmap()
>> - * provides a single page, and it is possible that the page is not
>> - * sufficient.
>> - * By using this area, we can map up to MAX_IO_APICS pages temporarily,
>> - * i.e. until the next __va_range() call.
>> - *
>> - * Important Safety Note:  The fixed I/O APIC page numbers are *subtracted*
>> - * from the fixed base.  That's why we start at FIX_IO_APIC_BASE_END and
>> - * count idx down while incrementing the phys address.
>> - */
>>  char *__init __acpi_map_table(unsigned long phys, unsigned long size)
> 
> Good catch. Removing documentation makes me sad, so how about replacing it 
> with a simple comment:
> 
> 	/*
> 	 * This is just a simple wrapper around early_ioremap(),
> 	 * with sanity checks for phys == 0 and size == 0:
> 	 */
> 
> ?

Yeah, agreed. So I will send the v2 patch.

> 
> Thanks,
> 
> 	Ingo


-- 
Thanks.
Zhang Yanfei
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/